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V118C

Phase 1

Healthy | Monoclonal antibody | Other |Merck & Company, Inc.|Last Updated: Apr 17, 2026

Target and mechanism

ModalityMonoclonal antibody

Also known as V118C (Stage 1)

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindACTIVE_CONTROLLED
Total Trials1
Total Enrollment65

FDA Designations

No designations recorded

Clinical trial landscape

V118C · 2 trials · 2 indications

Phase 1 2
NCT07300267A Clinical Study of Novel Pneumococcal Vaccine V118C in Children (V118C-002)Pneumococcal Infection
RECRUITING210 Analytics
NCT06611033A Study of V118 Formulation C (V118C) in Healthy Participants (V118C-001)Healthy
COMPLETED65 Analytics
PHASE1RECRUITING
A Clinical Study of Novel Pneumococcal Vaccine V118C in Children (V118C-002)
Pneumococcal InfectionUnlock trial analytics
PHASE1COMPLETED
A Study of V118 Formulation C (V118C) in Healthy Participants (V118C-001)
HealthyUnlock trial analytics

Study Endpoints

Primary Endpoints

Stage 1: Percentage of Participants With Immediate Adverse Events (AEs) Following Vaccination
Up to approximately 30 minutes postvaccination

An AE is any untoward medical occurrence in a patient or clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention. Percentage of participants with immediate AEs following vaccination will be reported.

Stage 1: Percentage of Participants With Solicited Injection-Site Adverse Events (AEs)
Up to approximately 7 days postvaccination

An AE is any untoward medical occurrence in a patient or clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention. A solicited AE is a predefined event that participants legally acceptable representative (LAR) are specifically asked about and record on their electronic vaccine report card (eVRC). Solicited injection-site AEs include redness, swelling, pain or tenderness and hard lump. Percentage of participants with solicited injection-site AEs will be reported.

Stage 1: Percentage of Participants With Solicited Systemic AEs
Up to approximately 7 days postvaccination

An AE is any untoward medical occurrence in a patient or clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention. A solicited AE is a predefined event that participants LAR are specifically asked about and record on their eVRC. Solicited systemic AEs include irritability, drowsiness, appetite lost, hives or welts, and fever. Percentage of participants with solicited systemic AEs will be reported.

Stage 1: Percentage of Participants With Unsolicited Systemic or Injection-Site AEs
Up to approximately 28 days postvaccination

An AE is any untoward medical occurrence in a patient or clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention. An unsolicited AE is an event that is not solicited using a eVRC and that is communicated by a participant. Percentage of participants with unsolicited Systemic or Injection-Site AEs will be reported.

Stage 1: Percentage of Participants With Serious Adverse Events (SAEs)
Up to approximately 12 months postvaccination

A serious adverse event (SAE) is an AE that is life-threatening, requires or prolongs an existing hospitalization, results in persistent or significant disability or incapacity, is a congenital anomaly or birth defect, or is another important medical event deemed such by medical or scientific judgment. Percentage of participants with one or more SAEs will be reported.

Stage 1: Percentage of Participants With Medically Attended AEs (MAAEs)
Up to approximately 12 months postvaccination

A MAAE is defined as an adverse event in which medical attention is received during an unscheduled, non-routine outpatient visit, such as an emergency department visit, office visit, or an urgent care visit with any medical personnel for any reason. Percentage of participants with MAAEs will be reported.

Stage 2: Percentage of Participants With Immediate AEs Following Vaccination
Up to approximately 30 minutes after each vaccination

An AE is any untoward medical occurrence in a patient or clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention. Percentage of participants with immediate AEs following vaccination will be reported.

Stage 2: Percentage of Participants With Solicited Injection-Site AEs
Up to approximately 7 days after each vaccination

An AE is any untoward medical occurrence in a patient or clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention. A solicited AE is a predefined event that participants LAR are specifically asked about and record on their eVRC. Solicited injection-site AEs include redness, swelling, pain or tenderness and hard lump. Percentage of participants with solicited injection-site AEs will be reported.

Stage 2: Percentage of Participants With Solicited Systemic AEs
Up to approximately 7 days after each vaccination

An AE is any untoward medical occurrence in a patient or clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention. A solicited AE is a predefined event that participants LAR are specifically asked about and record on their eVRC. Solicited systemic AEs include irritability, drowsiness, appetite lost, hives or welts, and fever. Percentage of participants with solicited systemic AEs will be recorded.

Stage 2: Percentage of Participants With Unsolicited Systemic or Injection-Site AEs
Up to approximately 28 days after each vaccination

An AE is any untoward medical occurrence in a patient or clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention. An unsolicited AE is an event that is not solicited using a eVRC and that is communicated by a participant. Percentage of participants with unsolicited Systemic or Injection-Site AEs will be reported.

Stage 2: Percentage of Participants With SAEs
Up to approximately 12 months postdose 4

A SAE is an AE that is life-threatening, requires or prolongs an existing hospitalization, results in persistent or significant disability or incapacity, is a congenital anomaly or birth defect, or is another important medical event deemed such by medical or scientific judgment. Percentage of participants with one or more SAEs will be reported.

Stage 2: Percentage of Participants With MAAEs
Up to approximately 12 months postdose 4

A MAAE is defined as an adverse event in which medical attention is received during an unscheduled, non-routine outpatient visit, such as an emergency department visit, office visit, or an urgent care visit with any medical personnel for any reason. Percentage of participants with MAAEs will be reported.

Number of Participants with Solicited Injection Site Adverse Events (AEs)
Up to approximately 7 days after each vaccination

An AE is defined as any unfavorable and unintended sign including an abnormal laboratory finding, symptom or disease associated with the use of a medical treatment or procedure, regardless of whether it is considered related to the medical treatment or procedure, that occurs during the course of the study. The number of participants with a solicited injection-site AE will be reported.

Number of Participants with Solicited Systemic AEs
Up to approximately 7 days after each vaccination

An AE is defined as any unfavorable and unintended sign including an abnormal laboratory finding, symptom or disease associated with the use of a medical treatment or procedure, regardless of whether it is considered related to the medical treatment or procedure, that occurs during the course of the study. The number of participants with a solicited systemic AE will be reported.

Number of Participants with Immediate AEs Following Vaccination
Up to approximately 30 minutes after each vaccination

An AE is defined as any unfavorable and unintended sign including an abnormal laboratory finding, symptom or disease associated with the use of a medical treatment or procedure, regardless of whether it is considered related to the medical treatment or procedure, that occurs during the course of the study. The number of participants with Immediate AEs following vaccination will be reported.

Number of Participants with Unsolicited AEs
Up to approximately 28 days after each vaccination

An AE is defined as any unfavorable and unintended sign including an abnormal laboratory finding, symptom or disease associated with the use of a medical treatment or procedure, regardless of whether it is considered related to the medical treatment or procedure, that occurs during the course of the study. An unsolicited AE is an AE that is not solicited using a vaccine report card (VRC) and that is communicated by a participant. The number of participants that experienced an unsolicited AE will be reported.

Number of Participants With a Serious Adverse Event (SAE)
Up to approximately 12 months after final vaccination

An SAE is defined as any untoward medical occurrence that at any dose, results in death, is life-threatening, requires inpatient hospitalization or prolongation of existing hospitalization, results in persistent or significant disability/incapacity, or is a congenital anomaly/birth defect. The number of participants who experience an SAE will be reported.

Number of Participants with a Medically Attended Adverse Event (MAAE)
Up to approximately 12 months after final vaccination

An MAAE is defined as an adverse event in which medical attention is received during an unscheduled, non-routine outpatient visit, such as an emergency room visit, office visit, or an urgent care visit with any medical personnel for any reason. The number of participants who experience an MAAE will be reported.

Number of Participants with an Event of Clinical Interest (ECI)
Up to approximately 12 months after final vaccination

An ECI includes but is not limited to: 1) An overdose defined as: A participant receiving more than 1 dose of study vaccine in a 24-hour period or more than 2 doses of study vaccine throughout the study. 2) Potential drug-induced liver injury (DILI) events defined as: An elevated aspartate aminotransferase (AST) or alanine aminotransferase (ALT) lab value that is ≥3 times the upper limit of normal (ULN) and an elevated total bilirubin lab value that is ≥2 times ULN and, at the same time, an alkaline phosphatase lab value that is \<2 times ULN, as determined by way of protocol-specified laboratory testing or unscheduled laboratory testing. 3) Potential immune-mediated disease (pIMDs) defined as: A subset of AEs that include either an established autoimmune disease(s) or Inflammatory and/or neurologic disorder(s), which might or might not have an autoimmune etiology. The number of participants who experience an ECI will be reported.

Secondary Endpoints

Stage 1: Geometric Mean Concentrations (GMCs) of Serotype-Specific Immunoglobulin G (IgG)
Up to approximately 30 days post vaccination
Stage 1: Ratio of GMCs of Serotype-Specific IgG of V118C to PCV20 [V118C/PCV20]
Approximately Day 30 postvaccination
Stage 1: Geometric Mean Fold Rises (GMFRs) of Serotype-Specific Immunoglobulin G (IgG)
Day 1 (Baseline) and approximately Day 30 postvaccination
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Study Design & Arms

AllocationRANDOMIZED
MaskingDOUBLE
ModelPARALLEL
PurposePREVENTION

Treatment Arms

ArmTypeDescription
V118C (Stage 1)EXPERIMENTALParticipants will receive a single 0.5 mL intramuscular (IM) injection of V118C administered at 12 to 15 months of age.
V118C (Stage 2)EXPERIMENTALParticipants will receive a single 0.5 mL IM injection of V118C administered at 2,4,6, and 12 months of age.
PCV20 (Stage 1)ACTIVE_COMPARATORParticipants will receive a single 0.5 mL IM injection of PCV20 administered at 12 to 15 months of age.
PCV20 (Stage 2)ACTIVE_COMPARATORParticipants will receive a single 0.5 mL IM injection of PCV20 administered at 2,4,6, and 12 months of age.
V118CEXPERIMENTALParticipants receive intramuscular (IM) injection of V118C in a 2-dose regimen administered on Day 1 and Day 29.
V118EXPERIMENTALParticipants receive IM injection of V118 in a 2-dose regimen administered on Day 1 and Day 29.
PREVNAR 20™ + SalineACTIVE_COMPARATORParticipants receive one dose of IM injection of PREVNAR 20™ in a 2-dose regimen on Day 1 followed by one dose of saline on Day 29.

Interventions

NameTypeDescription
V118C (Stage 1)BIOLOGICALIM administration of V118C
V118C (Stage 2)BIOLOGICALIM administration of V118C
PCV20 (Stage 1)BIOLOGICALIM administration of PCV20
PCV20 (Stage 2)BIOLOGICALIM administration of PCV20
V118CBIOLOGICALIntramuscular Administration
V118BIOLOGICALIntramuscular Administration
PREVNAR 20™BIOLOGICALIntramuscular Administration
SalineBIOLOGICALIntramuscular Administration
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Eligibility Criteria

Age Range2 Months to 15 Months
SexALL
Healthy VolunteersYes
Study Sites14

Inclusion Criteria: The main inclusion criteria include but are not limited to the following: Stage 1: * Is previously vaccinated with 3 routine infant doses of Pneumococcal 20-valent conjugate vaccine (PCV20) * Is 12 through 15 months of age Stage 2: \- Is approximately 2 months of age Both S...

Countries:United States
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Frequently asked questions about V118C

What is V118C?

V118C is an investigational monoclonal antibody being developed by Merck & Company, Inc. (MRK) for pneumococcal infection and for use in healthy participants. It is currently in Phase 1 clinical development, with studies evaluating the vaccine formulation in both adults and children.

What is V118C used for?

V118C is being studied for use in pneumococcal infection, a bacterial disease that can cause pneumonia, meningitis, and bloodstream infections. It is also being evaluated in healthy participants to assess safety and immune response. The vaccine is intended for prevention, with trials including children as young as 2 months.

Who makes V118C?

V118C is developed by Merck & Company, Inc., a global pharmaceutical company traded on the New York Stock Exchange under the ticker MRK. Merck is conducting clinical trials to evaluate the vaccine's safety and efficacy in preventing pneumococcal disease.

What phase is V118C in?

V118C is in Phase 1 clinical development. It is an investigational vaccine, meaning it has not yet been approved by regulatory authorities. Two Phase 1 trials are listed: one completed study in healthy adults and one actively recruiting study in children.

What clinical trials is V118C in?

V118C is being evaluated in two clinical trials. NCT06611033 is a completed Phase 1 study in healthy adults in the United States. NCT07300267 is an actively recruiting Phase 1 study in children with pneumococcal infection, also in the United States, with an enrollment target of 210 participants.

Is V118C the same as V118C (Stage 1)?

Yes, V118C is also known as V118C (Stage 1). This name distinguishes the specific formulation being tested in early-stage clinical trials. The vaccine is being developed by Merck & Company, Inc. under the ticker MRK.